[RoosterRedux]

But MDD is not low-grade depression (to use your term). It is clinical depression.

And you said, "For moderate to severe Major Depressive Disorder don't waste your time [with exercise].

Your statement just isn't true.

There may be exceptions of course, but your statement is general.

[steve86]

The phrase "low grade" is from the very first paragraph of the excerpt.

Our world-first trial shows improving diet and doing more physical activity can be as effective as therapy with a psychologist for treating low-grade depression.

That sounds reasonable to me -- try diet and exercise (among other therapies) for patients with low-grade depression.

I had ECT in the family. I served a three-year internship as Assistant Psychologist in a provincial psychiatric facility. My research interest was catatonia.

I have seen mild, moderate, and severe depression. Diet and exercise are not useful therapeutic strategies for the latter.

It is the "exception" where it would be, not the rule